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# Copyright (C) 2001-2015 by the Free Software Foundation, Inc.
#
# This file is part of GNU Mailman.
#
# GNU Mailman is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# GNU Mailman is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
# more details.
#
# You should have received a copy of the GNU General Public License along with
# GNU Mailman. If not, see <http://www.gnu.org/licenses/>.
"""Bounce runner."""
import logging
from flufl.bounce import all_failures, scan_message
from mailman.app.bounces import ProbeVERP, StandardVERP, maybe_forward
from mailman.core.runner import Runner
from mailman.interfaces.bounce import BounceContext, IBounceProcessor
from zope.component import getUtility
COMMASPACE = ', '
log = logging.getLogger('mailman.bounce')
elog = logging.getLogger('mailman.error')
class BounceRunner(Runner):
"""The bounce runner."""
def __init__(self, name, slice=None):
super(BounceRunner, self).__init__(name, slice)
self._processor = getUtility(IBounceProcessor)
def _dispose(self, mlist, msg, msgdata):
# List isn't doing bounce processing?
if not mlist.process_bounces:
return False
# Try VERP detection first, since it's quick and easy
context = BounceContext.normal
addresses = StandardVERP().get_verp(mlist, msg)
if len(addresses) > 0:
# Scan the message to see if it contained permanent or temporary
# failures. We'll ignore temporary failures, but even if there
# are no permanent failures, we'll assume VERP bounces are
# permanent.
temporary, permanent = all_failures(msg)
if len(temporary) > 0:
# This was a temporary failure, so just ignore it.
return False
else:
# See if this was a probe message.
addresses = ProbeVERP().get_verp(mlist, msg)
if len(addresses) > 0:
context = BounceContext.probe
else:
# That didn't give us anything useful, so try the old fashion
# bounce matching modules. This returns only the permanently
# failing addresses. Since Mailman currently doesn't score
# temporary failures, if we get no permanent failures, we're
# done.s
addresses = scan_message(msg)
# If that still didn't return us any useful addresses, then send it on
# or discard it. The addresses will come back from flufl.bounce as
# bytes/8-bit strings, but we must store them as unicodes in the
# database. Assume utf-8 encoding, but be cautious.
if len(addresses) > 0:
for address in addresses:
if isinstance(address, bytes):
try:
address = address.decode('utf-8')
except UnicodeError:
log.exception('Ignoring non-UTF-8 encoded '
'address: {0}'.format(address))
continue
self._processor.register(mlist, address, msg, context)
else:
log.info('Bounce message w/no discernable addresses: %s',
msg.get('message-id', 'n/a'))
maybe_forward(mlist, msg)
# Dequeue this message.
return False
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